Teleparallel gravity (TEGR) as a gauge theory: Translation or Cartan connection?

We question the status of TEGR, the Teleparallel Equivalent of General Relativity,
as a gauge theory of translations. We observe that TEGR (in its usual translation-gauge view) does not seem to realize the generally admitted requirements for a gauge theory for some symmetry group G: namely it does not present
a mathematical structure underlying the theory which relates to a principal G-bundle and the choice of a connection on it (the gauge field). We point out that, while it is usually presented as absent, the gauging of the

TBA

SOURIAU 2019 - 50 ans après SSD

Contact APC : Marc LACHIEZE-REY

Eikonal, black holes and holography

We consider high energy gravitational scattering of a light particle off

a heavy one. We compute the corresponding eikonal phase to all orders in the

impact parameter. We use the AdS/CFT correspondence to deduce a number

of consequences for strongly interacting conformal field theories of any dimensionality.

Annulé

TBA

Thermodynamics vs Dynamics of black holes

Tensor models: from random geometry to holography

I will provide a general introduction to tensor models and their applications to quantum gravity. Initially developed in the context of random geometry, as a generalization of the matrix models approach to 2d quantum gravity, tensor models and their large N expansion have more recently been taken advantage of in the context of holography. In particular, the "near AdS_2 / near CFT_1 correspondence" establishes a connection between strongly-coupled and explicitly solvable large N quantum mechanics and Jackiw-Teitelboim gravity in d=2.

LABORATOIRE

ASTROPARTICULE & COSMOLOGIE

Théorie